Cell
A cell represents a length of space along the conveyor that can be allocated to and occupied by conveyable items. A conveyor is divided into a set of cells to represent its length. A cell acts like a general unit of distance along the conveyor.
Constructors
Properties
A cell is occupied if it is covered by an item
The cell in front of this cell (towards the end of the segment), unless this cell is the end cell of the final segment and the conveyor is circular, then the next cell is the first cell of the first segment.
The cell immediately behind this cell (towards the front of the segment), unless the cell is first and the conveyor is circular, then the previous cell is the cell at the end of the last segment.
Functions
Returns this cell and the n-1 previous cells. There should be at least 1 cell returned. The first cell in the returned list is the furthest cell from the current cell. The last cell in the returned list is the current cell. If the conveyor is circular, the returned list may contain cells "before" the starting cell of the first entry cell. If the number of previous cells requested is larger than the number of cells in the conveyor, all cells are returned. If the conveyor is not circular, then the number of cells return may be less than requests because there are no previous cells before the first cell of the conveyor.